Don't forget to go ahead and recondition the other parts of the fuel system while you are there:

https://www.rx7club.com/3rd-gen-archives-73/injector-removal-reconditioning-replacement-232603/

 

New ones are expensive. Is there no one in your area of Spain that is capable of cleaning and flow-testing the ones you have?

 

Asking here, nobody knows as clean my injectors and testing, is incredible, everybody say me as is a strange car and engine, they don't like do it.

Also I don't find the fuel filter at spain and in my local mazda service I need waiting for one month more or less and the price is over 125$, very expensive I think.

Another one, my car has a CEL 05, I have seen this CEL is for the knock sensor, I don't think this is the problem but I need one knock sensor too.

Talking with one friend mechanic of here, he suggest me my problem can be one temp sensor, this temp sensor may be send one incorrect signal to ECU saying the car is cool and the ECU send more fuel to the injectors for it. What do you think?

resume: I need send my injectors to a good specialist in the world, I need one fuel filter and one knock sensor.

 

In most cases, the knock sensor code will retard the car which will cause it to consume more fuel than it should. Try resetting the ECU (unplug the battery and step on the brake pedal for 10-15 seconds) and see if the code comes back. Start with getting that addressed first then seeing how the car performs. If you get the code fixed and the car is still having problems, then move on to the fuel system.

The knock sensor is fairly expensive new (around $150 USD if I remember correctly).

 

If you still have a code, start by checking wiring to the knock sensor. It's located on the left side of the engine, near the front rotor trailing plug... and only has a short wire leading to a connector.

 

When I calculated my gas mileage, I realized im getting between 17-19 mpg depending on how I drive. Its a lot better then I thought. I had all maintenance done recently: NGK spark plugs, Bosch wires, fuel system cleaning, air filter, fuel filter.. almost time for another air filter tho.

Im just glad gas prices are down (for now)

I also agree that having the fuel injectors cleaned professionally will be cheaper then replacing them, and you will get the same result